Abstract
The increased titanium dioxide nanoparticles (TiO2-NPs) spread and their interaction with organic and inorganic pollutants arouses concern for the potential hazards for organisms and environment. This study tested in vitro the genotoxic effects of TiO2-NPs (1 μg/mL) and cadmium (Cd) (0.1 μg/mL) co-exposure using Dicentrarchus labrax embryonic cells (DLEC) as experimental model. The genotoxicity tests (Comet assay, Diffusion Assay and Random Amplification of Polymorphic DNA (RAPD-PCR) were conducted after 3, 24 and 48 hours of exposure to TiO2-NPs and Cd alone and in combination. The results showed that the percentage of DNA damage and apoptotic cells increases following 48 hours TiO2-NPs exposure, while DNA instability was detected for all the times tested. Cd induced genotoxic effects starting from 3 hour-exposure and for all the treatment times. Cd + TiO2-NPs co-exposure did not cause any genomic damage or apoptosis for all the exposure times. The possibility that Cd and TiO2-NPs form aggregates no longer able of penetrating the nucleus and damaging the genetic material is discussed.
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All data generated or analyzed during this study are included; any additional information is available from the corresponding author on reasonable request.
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Acknowledgments
The authors thank Dr. Anna Rita Taddei, Section of Electron Microscopy, Great Equipment Center, University of Tuscia, Viterbo, Italy, and Dr. Patrizia Guidi, Department of Clinical and Experimental Medicine, University of Pisa, Italy, for their help to performing Transmission Electron Microscopy (TEM) in cell.
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This research was partially supported by the Italian Ministry of Research (PRIN 2009FHHP2W)
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Filomena Mottola: conceptualization, writing and editing; Marianna Santonastaso, Concetta Iovine, Patrizia Guidi and Viviana Genualdo: methodology; Giada Frenzilli: formal analysis and editing; Simona Picchietti: methodology and review; Lucia Rocco: funding acquisition, project administration, review and editing. All authors have read and agreed to the published version of the manuscript.
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Mottola, F., Santonastaso, M., Iovine, C. et al. TiO2-NPs and cadmium co-exposure: in vitro assessment of genetic and genomic DNA damage on Dicentrarchus labrax embryonic cells. Environ Sci Pollut Res 29, 62208–62218 (2022). https://doi.org/10.1007/s11356-021-17645-6
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DOI: https://doi.org/10.1007/s11356-021-17645-6